Struct Limits 

pub struct Limits { /* private fields */ }

The budgets a connection enforces on incoming messages.

Every limit is checked before the bytes it governs are buffered or allocated: a declared Content-Length above max_body is refused on the header line, a chunk size is checked against the remaining body budget before its data is read, and the connection’s input buffer can never grow past 2 * (max_start_line + max_header_bytes) plus a fixed 16 KiB body window (64 KiB with the defaults): room for a pinned head plus one partial chunk line or trailer section.

The defaults are the budgets of LexerSketch Studio’s localhost server:

Budget	Default
request line / status line / chunk-size line	8 KiB
header section (all field lines)	16 KiB
one field line (headers and trailers)	8 KiB
header fields	100
trailer section, trailer fields	the header budgets
interim (1xx) responses per request (client)	16
body	1 MiB

Examples

use http_net::Limits;

let limits = Limits::new().with_max_body(64 * 1024).with_max_headers(32);
assert_eq!(limits.max_body(), 64 * 1024);
assert_eq!(limits.max_headers(), 32);
assert_eq!(limits.max_start_line(), 8 * 1024);

Implementations

impl Limits

pub const fn new() -> Self

The default budgets (see the table on Limits).

Examples

assert_eq!(http_net::Limits::new(), http_net::Limits::default());

pub const fn with_max_start_line(self, bytes: usize) -> Self

Sets the longest accepted request line, status line, or chunk-size line, in bytes including the CRLF. Clamped to 16..=16 MiB.

Examples

let l = http_net::Limits::new().with_max_start_line(1);
assert_eq!(l.max_start_line(), 16);

pub const fn with_max_header_bytes(self, bytes: usize) -> Self

Sets the largest accepted header section (every field line plus the blank line that ends it), in bytes. Clamped to 2..=16 MiB.

Examples

let l = http_net::Limits::new().with_max_header_bytes(4096);
assert_eq!(l.max_header_bytes(), 4096);

pub const fn with_max_headers(self, count: usize) -> Self

Sets the most header fields accepted in one message (trailer fields are counted against the same number separately). Clamped to 0..=65536.

Examples

let l = http_net::Limits::new().with_max_headers(8);
assert_eq!(l.max_headers(), 8);

pub const fn with_max_field_line(self, bytes: usize) -> Self

Sets the longest accepted single field line (name, colon, value, and CRLF), in headers and trailers alike. Clamped to 4..=16 MiB. A line over it is HttpError::FieldLineTooLong (431), checked before the rest of the line is buffered. The whole section is still bounded by max_header_bytes.

Examples

let l = http_net::Limits::new().with_max_field_line(1024);
assert_eq!(l.max_field_line(), 1024);

pub const fn with_max_trailer_bytes(self, bytes: usize) -> Self

Sets the largest accepted trailer section, in bytes (every trailer field line plus the blank line that ends it). Clamped to 2..=16 MiB. Until it is set it follows max_header_bytes.

Examples

let l = http_net::Limits::new().with_max_trailer_bytes(512);
assert_eq!(l.max_trailer_bytes(), 512);
assert_eq!(http_net::Limits::new().max_trailer_bytes(), 16 * 1024);

pub const fn with_max_trailer_fields(self, count: usize) -> Self

Sets the most trailer fields accepted in one message. Clamped to 0..=65536. Until it is set it follows max_headers.

Examples

let l = http_net::Limits::new().with_max_trailer_fields(4);
assert_eq!(l.max_trailer_fields(), 4);

pub const fn with_max_interim(self, count: u16) -> Self

Sets the most interim (1xx) responses a client accepts before the final response to one request; one more is HttpError::TooManyInterim. The interim heads together also count against max_header_bytes.

Examples

let l = http_net::Limits::new().with_max_interim(2);
assert_eq!(l.max_interim(), 2);

pub const fn with_max_body(self, bytes: u64) -> Self

Sets the largest accepted body, in bytes after chunked decoding.

Examples

let l = http_net::Limits::new().with_max_body(0);
assert_eq!(l.max_body(), 0);

pub const fn max_start_line(&self) -> usize

The longest accepted start line or chunk-size line, CRLF included.

Examples

assert_eq!(http_net::Limits::new().max_start_line(), 8192);

pub const fn max_header_bytes(&self) -> usize

The largest accepted header section, in bytes.

Examples

assert_eq!(http_net::Limits::new().max_header_bytes(), 16384);

pub const fn max_headers(&self) -> usize

The most header fields accepted in one message.

Examples

assert_eq!(http_net::Limits::new().max_headers(), 100);

pub const fn max_field_line(&self) -> usize

The longest accepted single field line, CRLF included.

Examples

assert_eq!(http_net::Limits::new().max_field_line(), 8192);

pub const fn max_trailer_bytes(&self) -> usize

The largest accepted trailer section, in bytes.

Examples

let l = http_net::Limits::new().with_max_header_bytes(4096);
assert_eq!(l.max_trailer_bytes(), 4096);

pub const fn max_trailer_fields(&self) -> usize

The most trailer fields accepted in one message.

Examples

assert_eq!(http_net::Limits::new().max_trailer_fields(), 100);

pub const fn max_interim(&self) -> u16

The most interim responses a client accepts per request.

Examples

assert_eq!(http_net::Limits::new().max_interim(), 16);

pub const fn max_body(&self) -> u64

The largest accepted body, in bytes.

Examples

assert_eq!(http_net::Limits::new().max_body(), 1 << 20);

pub const fn buffer_capacity(&self) -> usize

The input buffer’s hard capacity, head + max(head, max_trailer_bytes) + 16 KiB where head = max_start_line + max_header_bytes (64 KiB with the defaults), so a driver can plan memory per connection.

The current message’s head stays pinned while its body streams, and the decoder may need one whole chunk-size line or trailer section on top of it, so this always fits whatever the parser is waiting to complete. A connection’s memory is this buffer plus max_headers field records of 16 bytes each (and as many for trailers when they are reported).

Examples

use http_net::Limits;

assert_eq!(Limits::new().buffer_capacity(), 64 * 1024);
let small = Limits::new().with_max_start_line(1024).with_max_header_bytes(4096);
assert_eq!(small.buffer_capacity(), 2 * (1024 + 4096) + 16 * 1024);

Trait Implementations

impl Clone for Limits

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Limits

impl Debug for Limits

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Limits

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Limits

impl Hash for Limits

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Limits

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Limits